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asymmetric digital subscriber line (ADSL) interface
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Physical WAN interface for connecting a Services Router to a digital
subscriber line access multiplexer (DSLAM). An ADSL interface allocates
line bandwidth asymmetrically with downstream (provider-to-customer)
data rates of up to 8 Mbps for ADSL, 12 Mbps for ADSL2,
and 25 Mbps for ADSL2+, and upstream (customer-to-provider) rates
of up to 800 Kbps for ADSL and 1 Mbps for ADSL2 and ADSL2+,
depending on the implementation.
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ADSL2 interface
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An ADSL interface that supports ITU-T Standards G.992.3 and
G.992.4 and allocates downstream (provider-to-customer) data rates
of up to 12 Mbps and upstream (customer-to-provider) rates of
up to 1 Mbps.
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ADSL2+ interface
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An ADSL interface that supports ITU-T Standard G.992.5 and allocates
downstream (provider-to-customer) data rates of up to 25 Mbps
and upstream (customer-to-provider) rates of up to 1 Mbps.
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Annex A
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ITU-T Standard G.992.1 that defines how ADSL works over plain
old telephone service (POTS) lines.
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Annex B
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ITU-T Standard G.992.1 that defines how ADSL works over Integrated
Services Digital Network (ISDN) lines.
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ITU-T G.991.2
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International Telecommunication Union standard describing a
data transmission method for symmetric high-speed digital subscriber
line (SHDSL) as a means for data transport in telecommunications access
networks. The standard also describes the functionality required for
interoperability of equipment from various manufacturers.
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ITU-T G.992.1
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International Telecommunication Union standard that requires
the downstream (provider-to-customer) data transmission to consist
of full-duplex low-speed bearer channels and simplex high-speed bearer
channels. In the upstream (customer-to-provider) transmissions, only
low-speed bearer channels are provided.
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ITU-T G.994.1
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International Telecommunication Union standard describing the
types of signals, messages, and procedures exchanged between digital
subscriber line (DSL) equipment when the operational modes of equipment
need to be automatically established and selected.
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ITU-T G.997.1
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International Telecommunication Union standard describing the
physical layer management for asymmetric digital subscriber line (ADSL)
transmission systems. The standard specifies the means of communication
on a transport transmission channel defined in the physical layer
recommendations. In addition, the standard describes the content and
syntax of network elements for configuration, fault management, and
performance management.
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symmetric high-speed digital subscriber line (G.SHDSL)
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Physical WAN symmetric DSL interface capable of sending and
receiving high-speed symmetrical data streams over a single pair of
copper wires at rates between 192 Kbps and 2.31 Mbps. G.SHDSL incorporates
features of other DSL technologies such as asymmetric DSL and transports
T1, E1, ISDN, Asynchronous Transfer Mode (ATM), and IP signals.
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symmetric high-speed digital subscriber line (SHDSL)
transceiver unit–remote (STU–R)
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Equipment that provides symmetric high-speed digital subscriber
line (SHDSL) connections to remote user terminals such as data terminals
or telecommunications equipment.
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